Therefore, when I considered this carefully, the c...

Although all the good arts serve to draw man's mind away from vices and lead it toward better things, this function can be more fully performed by this art, which also provides extraordinary intellectual pleasure.

Not a few other very eminent and scholarly men made the same request, urging that I should no longer through fear refuse to give out my work for the common benefit of students of Mathematics.

For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.

The heart never grows better by age I fear rather worse, always harder. A young liar will be an old one, and a young knave will only be a greater knave as he grows older.

Few women, I fear, have had such reason as I have to think the long sad years of youth were worth living for the sake of middle age.

I had used eclectic therapy and behavior therapy on myself at the age of 19 to get over my fear of public speaking and of approaching young women in public.

I think I'm a bit less inhibited, and not thinking too much before speaking. It's not about being shameful, I'm just a bit more unabashedly myself because of this thing, and it probably started at age 15. I can be around people and say what I think without fear.

Youth is the gift of nature, but age is a work of art.

It is utterly false and cruelly arbitrary to put all the play and learning into childhood, all the work into middle age, and all the regrets into old age.

Old age is not a matter for sorrow. It is matter for thanks if we have left our work done behind us.

Have regular hours for work and play make each day both useful and pleasant, and prove that you understand the worth of time by employing it well. Then youth will be delightful, old age will bring few regrets, and life will become a beautiful success.